saint-francis,
Well, by disabling Outpost and still having the same issue, at least eliminates the firewall as being the problem. I'm convinced it's a DNS issue but, I'm not 100% positive. You've already flushed your DNS on your system and that didn't work. I wonder if it's a DNS setting on your router? Could you do me a favor and run Ipconfig /all for me and copy the results here ? Maybe we could take a look at your DHCP and IP settings and see if something looks odd there. If that's not the problem, maybe it's a router setting. Let's try this step first.
In case you don't know:
Start-->Run-->Cmd
Ipconfig /All